2 relay activations for parachute

Dear All,
Is there a way to trigger 2 relays with a customisable time delay once the programmed landing sequence begins.
The idea is to activate 2 parachutes one after the other with a time delay to increase safety to the airframe.

this question would be better asked in the arduplane forum.

@Michael_Oborne There was an option in Mission planner to trigger a relay (Parachute) after a specific waypoint (It still does) but it required a dummy waypoint right after that. I read this long back but now unable to source the description again.